Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy

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                                and the Eighth series would be in close accordance.

now the fact is, that the results of the Fifth and
Seventh Series agree pretty well, when regard is had
to the circumstances of forced temperature (the
discordance 0.00000149 corresponds to 0<sup>s</sup>.3 per day
nearly, or to 0<sup>o</sup>.72 of temperature), but the discordance
between the Sixth and Eighth is 0.00000842
(which corresponds to 1<sup>s</sup>.68 per day, or to 4<sup>o</sup>.09 of
temperature). It would therefore seem, at first sight,
that there is strong reason to suppose that some change
took place in one of the pendulums after the Seventh
Series.

74. As there is no reason whatever for supporting a
change before the <s>[?]</s> end of the Seventh Series, let
us take the mean of the Fifth and Seventh Series,
and compare it (A) with the Sixth Series alone, (B)
with the mean of the Sixth and Eighth Series; and
from these comparisons let us in each case obtain a
relation between the two pendulums nearly independent
of temperature. Thus we shall have,
                            
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Manuscript details

Author
George Biddell Airy
Reference
PT/54/5
Series
PT
Date
1855
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Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy, 1855. From The Royal Society, PT/54/5

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